Be nice if you had a picture.....
If you have a small fan that can blow down the beam - try it! You know, like a computer fan or a small room fan. If that's enough you've got a solution. If it helps appreciatively but not quite enough then it's time to try a static augmented fan.
Very dry air can transport static just like the air being used to carry away your static. That said, there is probably no
static source in your air to cause it to bring static to your beam. The beam is becoming charged via triboelectric generation from the insulated bar being rubbed by the insulated rubber wheel.
If you could blow moist air across your beam then the static would dissipate in a New York Minute!
Peel some scotch tape off a roll and then hold it next to a surface. You will see the tape attracted via the static charge generated by the unrolling tape.
Do it again, then before holding the tape next to a surface, blow on it, mouth open, like you want to fog your glasses before wiping them. Now hold the tape near a surface. NADA - the charge was shorted and conducted away on your breath and to your fingers.
This would work well on your beam too.
As for static films.. Could work, could not work! There are antistatic soaps that you can spray on things but your app doesn't sound like this would work too well, and would require frequent reapplication.
Keith Cress
Flamin Systems, Inc.-